EP1845253A1 - Brennstoffinjektor einer Brennkraftmaschine - Google Patents
Brennstoffinjektor einer Brennkraftmaschine Download PDFInfo
- Publication number
- EP1845253A1 EP1845253A1 EP06425265A EP06425265A EP1845253A1 EP 1845253 A1 EP1845253 A1 EP 1845253A1 EP 06425265 A EP06425265 A EP 06425265A EP 06425265 A EP06425265 A EP 06425265A EP 1845253 A1 EP1845253 A1 EP 1845253A1
- Authority
- EP
- European Patent Office
- Prior art keywords
- needle
- rod
- injector according
- spring
- area
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Granted
Links
Images
Classifications
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
- F02M—SUPPLYING COMBUSTION ENGINES IN GENERAL WITH COMBUSTIBLE MIXTURES OR CONSTITUENTS THEREOF
- F02M61/00—Fuel-injectors not provided for in groups F02M39/00 - F02M57/00 or F02M67/00
- F02M61/04—Fuel-injectors not provided for in groups F02M39/00 - F02M57/00 or F02M67/00 having valves, e.g. having a plurality of valves in series
- F02M61/10—Other injectors with elongated valve bodies, i.e. of needle-valve type
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
- F02M—SUPPLYING COMBUSTION ENGINES IN GENERAL WITH COMBUSTIBLE MIXTURES OR CONSTITUENTS THEREOF
- F02M61/00—Fuel-injectors not provided for in groups F02M39/00 - F02M57/00 or F02M67/00
- F02M61/16—Details not provided for in, or of interest apart from, the apparatus of groups F02M61/02 - F02M61/14
- F02M61/20—Closing valves mechanically, e.g. arrangements of springs or weights or permanent magnets; Damping of valve lift
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
- F02M—SUPPLYING COMBUSTION ENGINES IN GENERAL WITH COMBUSTIBLE MIXTURES OR CONSTITUENTS THEREOF
- F02M47/00—Fuel-injection apparatus operated cyclically with fuel-injection valves actuated by fluid pressure
- F02M47/02—Fuel-injection apparatus operated cyclically with fuel-injection valves actuated by fluid pressure of accumulator-injector type, i.e. having fuel pressure of accumulator tending to open, and fuel pressure in other chamber tending to close, injection valves and having means for periodically releasing that closing pressure
- F02M47/027—Electrically actuated valves draining the chamber to release the closing pressure
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
- F02M—SUPPLYING COMBUSTION ENGINES IN GENERAL WITH COMBUSTIBLE MIXTURES OR CONSTITUENTS THEREOF
- F02M61/00—Fuel-injectors not provided for in groups F02M39/00 - F02M57/00 or F02M67/00
- F02M61/04—Fuel-injectors not provided for in groups F02M39/00 - F02M57/00 or F02M67/00 having valves, e.g. having a plurality of valves in series
- F02M61/10—Other injectors with elongated valve bodies, i.e. of needle-valve type
- F02M61/12—Other injectors with elongated valve bodies, i.e. of needle-valve type characterised by the provision of guiding or centring means for valve bodies
Definitions
- the present invention relates to a fuel injector for an internal-combustion engine.
- the invention relates to an injector comprising a casing, fixed on which is a nebulizer having a nozzle for the fuel under pressure, an axially mobile needle for opening and closing the nozzle by means of a first end thereof, and a rod for controlling the needle, which is controlled by the fuel under pressure, aided by a compression spring.
- control rod is substantially coaxial with the needle, which is normally pushed into a closing position of the nozzle by the fuel under pressure in a control chamber, associated to a metering solenoid valve.
- the compression spring is set in a cavity of the casing and acts on the needle in general through a washer or other element for adjustment of the lift of the needle and/or of the pre-loading of the spring.
- set between the rod and the needle is an intermediate element, which is provided in classes, such as to enable adjustment of the total axial dimensions of the ensemble formed by the needle, the intermediate element and the rod.
- the intermediate element presents the drawback of generally causing a certain transverse component of the action of the rod on the needle, which leads to an irregular wear and hence a faster deterioration of the injector.
- the intermediate element In order to limit this drawback, generally the intermediate element must be made with very high precision, which consequently renders it relatively costly and complex to provide.
- the needle has a second end having a conical depression, on which the rod acts.
- the conical depression of the needle is engaged through an intermediate ball.
- the conical depression of the needle is engaged directly by one end of the rod, which is shaped so as to guarantee a perfectly axial resultant of the mutual action.
- the aim of the invention is to provide a fuel injector that will present high reliability and a limited cost, eliminating the drawbacks of fuel injectors according to the known art.
- a fuel injector for an internal-combustion engine as defined in Claim 1.
- the spring acts on the needle through perforated intermediate means axially engaging with a portion adjacent to the end of the rod and are formed by a bushing having an area or surface of engagement with the needle with an external diameter that is smaller than or equal to that of the needle.
- number 1 designates as a whole a fuel injector for an internal-combustion engine, in particular for a diesel engine (not illustrated).
- the injector 1 comprises an external hollow casing 2, which extends along an axis 3 and has a side inlet 5, designed to be supplied with fuel at a high pressure.
- the injector 1 further comprises a terminal nebulizer 7, for injecting the fuel into a corresponding cylinder of the engine. Normally, the nebulizer 7 is kept closed by a conical end 8 of a shutter needle 9.
- the nebulizer 7 is carried by a body, referred to hereinafter as nozzle 10, which is coaxial with respect to the casing 2 and is fixed in a known way to a portion 11 of the casing 2 itself.
- nozzle 10 a body
- Another portion 12 of the casing 2 is set on the opposite side with respect to the nozzle 10 and houses an electromagnetically controlled metering valve 13, of a known type and not described in detail.
- the valve 13 has an outlet 14 for sending, towards the usual fuel tank (not illustrated), the fuel discharged by the valve 13 itself and the part of fuel that leaks through the internal components of the injector 1.
- the nozzle 10 carries a cylindrical axial compartment 16, which comprises a cylindrical hole 17, axially guided in which is, in a fluid-tight way, a portion 18 of the needle 9, which hence shares the axis 3.
- the compartment 16 is engaged by a second portion 19 of the needle 9, which terminates with the end 8 and has a diameter slightly smaller than that of the portion 18.
- a channel 20 defined between the portion 19 and the wall of the axial compartment 16 is a channel 20, which, on one side, gives out into the nebulizer 7 and on the other is in communication with the inlet 5, through a pipe 21 and an annular injection chamber 22.
- the injector 1 further comprises an axial control rod 23, which, under the control of the valve 13, is designed to slide in a compartment 24 of the portion 11 of the casing 2, which also shares the axis 3.
- the valve 13 comprises a valve body 25 fixed to the body 2 of the injector 1, which is provided with an axial hole 26, guided in which is, in a fluid-tight way, a portion 27 of the rod 23.
- the portion 27 terminates at the top with a surface 28 that defines a control chamber 29.
- the chamber 29 is in communication with the inlet 5 for the fuel via a calibrated inlet hole 30 and with the outlet 14 via a calibrated discharge hole 31.
- the latter is normally kept closed by a shutter 32 controlled in a known way by an electromagnet 33.
- the rod 23 is provided with one end 34 opposite to the surface 28, which is designed to act on a second end 35 of the needle 9 opposite to the conical end 8.
- the rod 23 is thus subjected to the opposite axial thrusts of the pressure of the fuel present in the injection chamber 22 on the needle 9 and of the pressure of the fuel present in the control chamber 29. Normally, with the valve 13 closed, the pressure of the fuel on the rod 23 prevails over the pressure on the needle 9 so that the nebulizer 7 is kept closed.
- the compartment 24 of the portion 11 of the casing 2 comprises a bottom portion 36 having a larger diameter, which forms an annular shoulder 37.
- the rod 23 is provided with a portion 38 adjacent to the end 34, set around which is a compression spring 39 housed in the portion 36 of the compartment 24 and designed to contribute to carrying the needle 9 into a closing position, as will be seen in greater detail in what follows.
- the spring 39 acts on the needle 9 through perforated intermediate means, designated as a whole by 40, which are in axial engagement with the portion 38 of the rod 23, the end 34 of which is designed to engage directly and at the front the second end 35 (see also Figure 2) of the needle 9, adjacent to the portion 18.
- the end 34 of the rod 23 and the end 35 of the needle 9 are represented by two corresponding front surfaces, which are in contact with one another.
- the end 34 of the rod 23 has an arched shaped or is shaped like a spherical cap, whilst the end 35 of the needle 9 is preferably plane.
- the perforated intermediate means 40 comprise an area 43, which is able to slide axially, with a certain amount of play, in the portion 36 of the compartment 16. Furthermore, the intermediate means 40 comprise an area 44 having an external diameter smaller than that of the area 43 and smaller than the diameter of the portion 18 of the needle 9. In this way, any possible displacement of the area 43 in the portion 17 of the compartment 16 of the nozzle 10 is allowed, in the case where the end 35 of the needle 9 were to be inside the portion 17 itself, ensuring that the load of the spring 39 will be transmitted only to the needle 9 excluding the nozzle 10 from said load.
- the two areas 43 and 44 each have an axial hole 45 of a diameter corresponding to the diameter of the portion 38 of the rod 23 so that the means 40 are guided axially by the portion 38 of the rod 23 through said hole 45.
- the portion 38 has a diameter smaller than that of the portion 18 of the needle 9 so that also the end 34 of the rod 23 has a diameter smaller than that of the end 35 of the needle 9.
- the two areas 43 and 44 are made of a single piece and form a single bushing 40.
- the two areas 43 and 44 are cylindrical and have two external annular, plane, surfaces 47 and 48, which are opposite and perfectly parallel to one another.
- the two areas 43 and 44 form between them an annular shoulder 49, which is also external.
- the compression spring 39 can act directly on the plane surface 47 of the bushing 40, whilst the plane surface 48 is designed to act directly against an annular portion of the end or surface 35 of the needle 9.
- the two areas 43a and 44a also form a single bushing 40a, but the area 44a has the shape of a truncated cone instead of being cylindrical.
- the surface 48 of the area 44a acts also against the end 35 of the needle 9 (see also Figure 2), but its external diameter and the angle of opening of the conical area 44a are such that, when the needle 9 is in the position for closing the nebulizer 7, the external surface shaped like a truncated cone of the area 44a will not touch the edge of the cylindrical hole 17 of the nozzle 10.
- the intermediate means 40b comprise two areas formed by two separate bushings 43b and 44b, which both have cylindrical external lateral surfaces.
- the two plane surfaces in contact with the two bushings 43b and 44b must be machined with a precision sufficient to guarantee the parallelism of the two external plane surfaces 47 and 48.
- the surfaces 47 and 48 are external to the hole 45 and are hence in sight. In particular, they are without any projection in the bottom area so that machining thereof is simpler and more precise. Furthermore, there is no need to have any adjustable element between the spring 39 and the intermediate means 40, 40a and 40b nor a resting element between the spring 39 itself and the shoulder 37. However, such an adjustment or resting element does not modify operation of the injector 1.
- the surfaces of contact of the ends 34, 35 of the rod 23 and of the needle 9 can both be plane or curved in a complementary way.
- the bushing 40 of Figure 2 can be provided with a groove made between the shoulder 49 and the external lateral surface of the area 44, for example, for machining requirements. It is moreover possible to provide between the cylindrical areas 43 and 44 a linked area of transition different from the conical one.
- the external surface of the area 44a of the bushing 40a can also be shaped differently, or the areas 43a and 44a can be englobed in a single conical surface between the plane surfaces 47 and 48.
- the external surface of the bushing 44b can be conical or with a shaped profile.
- the bushing 40 can have a constant diameter, whereas the portion 18 of the nozzle 9 can be provided with an undercut for enabling its displacement, or else said portion 18 can have a length such that its end 35 will remain always outside the hole 17.
Landscapes
- Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Combustion & Propulsion (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Physics & Mathematics (AREA)
- Fluid Mechanics (AREA)
- Fuel-Injection Apparatus (AREA)
Priority Applications (7)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DE602006003631T DE602006003631D1 (de) | 2006-04-13 | 2006-04-13 | Brennstoffinjektor einer Brennkraftmaschine |
EP06425265A EP1845253B1 (de) | 2006-04-13 | 2006-04-13 | Brennstoffinjektor einer Brennkraftmaschine |
AT06425265T ATE414223T1 (de) | 2006-04-13 | 2006-04-13 | Brennstoffinjektor einer brennkraftmaschine |
US11/616,695 US7527210B2 (en) | 2006-04-13 | 2006-12-27 | Fuel injector for an internal-combustion engine |
JP2006354068A JP4686441B2 (ja) | 2006-04-13 | 2006-12-28 | 内燃機関用燃料噴射器 |
KR1020060136018A KR20070102377A (ko) | 2006-04-13 | 2006-12-28 | 내연기관용 연료 분사기 |
CN200610156476XA CN101054942B (zh) | 2006-04-13 | 2006-12-31 | 内燃机的燃料喷射器 |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
EP06425265A EP1845253B1 (de) | 2006-04-13 | 2006-04-13 | Brennstoffinjektor einer Brennkraftmaschine |
Publications (2)
Publication Number | Publication Date |
---|---|
EP1845253A1 true EP1845253A1 (de) | 2007-10-17 |
EP1845253B1 EP1845253B1 (de) | 2008-11-12 |
Family
ID=36954841
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP06425265A Active EP1845253B1 (de) | 2006-04-13 | 2006-04-13 | Brennstoffinjektor einer Brennkraftmaschine |
Country Status (7)
Country | Link |
---|---|
US (1) | US7527210B2 (de) |
EP (1) | EP1845253B1 (de) |
JP (1) | JP4686441B2 (de) |
KR (1) | KR20070102377A (de) |
CN (1) | CN101054942B (de) |
AT (1) | ATE414223T1 (de) |
DE (1) | DE602006003631D1 (de) |
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
CN104196665A (zh) * | 2014-08-29 | 2014-12-10 | 龙口龙泵燃油喷射有限公司 | 一种高压共轨喷油器 |
Families Citing this family (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE102012212266B4 (de) | 2012-07-13 | 2015-01-22 | Continental Automotive Gmbh | Fluidinjektor |
DE102012212264B4 (de) | 2012-07-13 | 2014-02-13 | Continental Automotive Gmbh | Verfahren zum Herstellen eines Festkörperaktuators |
CN111632781B (zh) * | 2020-06-11 | 2021-01-08 | 宁波震裕科技股份有限公司 | 一种新能源汽车电机铁芯级进模的自动喷胶控制系统 |
Citations (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
EP1081372A2 (de) * | 1999-08-31 | 2001-03-07 | Denso Corporation | Kraftstoffeinspritzvorrichtung |
US20020033423A1 (en) * | 2000-04-28 | 2002-03-21 | Siegfried Ruthardt | Common rail injector |
DE10148861A1 (de) * | 2001-10-04 | 2003-04-24 | Bosch Gmbh Robert | Injektor zum Einspritzen von Kraftstoff in die Brennkammer einer Brennkraftmaschine |
US20050178859A1 (en) * | 2004-02-13 | 2005-08-18 | Denso Corporation | Fuel injector for an internal combustion engine |
Family Cites Families (8)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE3907569A1 (de) * | 1989-03-09 | 1990-09-13 | Bosch Gmbh Robert | Kraftstoff-einspritzduese fuer brennkraftmaschinen |
US5544816A (en) * | 1994-08-18 | 1996-08-13 | Siemens Automotive L.P. | Housing for coil of solenoid-operated fuel injector |
US5692723A (en) * | 1995-06-06 | 1997-12-02 | Sagem-Lucas, Inc. | Electromagnetically actuated disc-type valve |
JPH0942034A (ja) * | 1995-07-28 | 1997-02-10 | Mazda Motor Corp | 直噴ディーゼルエンジンの燃料噴射装置 |
US5921475A (en) * | 1997-08-07 | 1999-07-13 | Ford Motor Company | Automotive fuel injector |
JP2000179425A (ja) * | 1998-12-15 | 2000-06-27 | Denso Corp | 燃料噴射装置 |
US6520150B1 (en) * | 2000-08-23 | 2003-02-18 | Detroit Diesel Corporation | Fuel injector assembly and internal combustion engine including same |
US7059301B2 (en) * | 2003-02-20 | 2006-06-13 | Caterpillar Inc. | End of injection rate shaping |
-
2006
- 2006-04-13 DE DE602006003631T patent/DE602006003631D1/de active Active
- 2006-04-13 EP EP06425265A patent/EP1845253B1/de active Active
- 2006-04-13 AT AT06425265T patent/ATE414223T1/de not_active IP Right Cessation
- 2006-12-27 US US11/616,695 patent/US7527210B2/en active Active
- 2006-12-28 KR KR1020060136018A patent/KR20070102377A/ko active Search and Examination
- 2006-12-28 JP JP2006354068A patent/JP4686441B2/ja active Active
- 2006-12-31 CN CN200610156476XA patent/CN101054942B/zh active Active
Patent Citations (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
EP1081372A2 (de) * | 1999-08-31 | 2001-03-07 | Denso Corporation | Kraftstoffeinspritzvorrichtung |
US20020033423A1 (en) * | 2000-04-28 | 2002-03-21 | Siegfried Ruthardt | Common rail injector |
DE10148861A1 (de) * | 2001-10-04 | 2003-04-24 | Bosch Gmbh Robert | Injektor zum Einspritzen von Kraftstoff in die Brennkammer einer Brennkraftmaschine |
US20050178859A1 (en) * | 2004-02-13 | 2005-08-18 | Denso Corporation | Fuel injector for an internal combustion engine |
Cited By (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
CN104196665A (zh) * | 2014-08-29 | 2014-12-10 | 龙口龙泵燃油喷射有限公司 | 一种高压共轨喷油器 |
CN104196665B (zh) * | 2014-08-29 | 2017-06-23 | 龙口龙泵燃油喷射有限公司 | 一种高压共轨喷油器 |
Also Published As
Publication number | Publication date |
---|---|
US20070240682A1 (en) | 2007-10-18 |
JP2007285294A (ja) | 2007-11-01 |
JP4686441B2 (ja) | 2011-05-25 |
ATE414223T1 (de) | 2008-11-15 |
CN101054942B (zh) | 2010-09-22 |
EP1845253B1 (de) | 2008-11-12 |
DE602006003631D1 (de) | 2008-12-24 |
US7527210B2 (en) | 2009-05-05 |
CN101054942A (zh) | 2007-10-17 |
KR20070102377A (ko) | 2007-10-18 |
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